M4.7 earthquake 121 km SSE of Pangai, Tonga
A magnitude 4.7 earthquake struck 121 km SSE of Pangai, Tonga on Fri, May 23, 1975, 7:02 PM GMT+13 (06:02 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.7 85 km E of ‘Ohonua, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1975-05-23 06:02:16 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 20.800° S, 173.836° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 14
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 9 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.5131 km ENE of ‘Ohonua, Tonga · 18758 days ago · 19 km deep · 14 km away
- 5.1118 km SSE of Pangai, Tonga · 18758 days ago · 33 km deep · 4 km away
- 5.064 km S of Pangai, Tonga · 18737 days ago · 39 km deep · 70 km away
- 5.1101 km SSE of Pangai, Tonga · 18737 days ago · 33 km deep · 22 km away
- 5.075 km E of ‘Ohonua, Tonga · 18731 days ago · 33 km deep · 77 km away
- 4.677 km SE of Pangai, Tonga · 18729 days ago · 33 km deep · 57 km away
- 5.490 km SSE of Pangai, Tonga · 18726 days ago · 23 km deep · 40 km away
- 5.785 km E of ‘Ohonua, Tonga · 18716 days ago · 15 km deep · 59 km away
- 4.9117 km E of ‘Ohonua, Tonga · 18706 days ago · 33 km deep · 38 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000b4t. Read Wed, Sep 30, 2026, 6:13 PM UTC.